I think the last session is going to be crucial. England need two wickets at least in order to give themselves a chance. If these two are still there at close of play the game is over already for England.

I hope you're right, but England haven't performed since they met India last summer, and after the manner in which they capitulated to Pakistan earlier this year, I am really fearing for them facing Ashwin and the other one (oija?)

Ashwin is not as good as Swann or even Anil Kumble or even perhaps Harbajan (when in form), so I would not fear him honestly.
Unfortunately the Harbajan Singh of old is no more there else he could have been a handful - his turn and bounce can be a handful for any batsman.

When you say "surely", what do you base that on? Just hope? I ask because in his most recent games he has not shown the technical prowess that has been his primary skill all these years. So someone like Swann will always be a big threat to him.